Edward b



(Nb Model.)

B. B. PARKHURST LEATHER/DRESSING MACHINE.

N0. 604,903. Patented May 31, 1898f \X/if B55125- 0w W YHE norms Pzmacu; mqiaumov, WASHIN UNITED STAT S- PATENT OFFICE.

EDWARD B. PARKHURST, OF WOBURN, MASSACHUSETTS, ASSIGNOR TO I JAMES T. FREEMAN AND HENRY F. DAVIS, OF SAME PLACE.

LEATHER-DRESSING MACHINE.

SPEGIFIGATION'forming part of Letters Patent No. 604,903, dated May 31, 1898.

Application filed October 1, 1897.

'To all whom it mag concern Be it known that LEDWARD B. PARKHURST,

a citizen of the United States, residing at :following is a specification, reference being had therein to the accompanying drawings. I first shall describe my invention with reference to the accompanying drawings, which represent the best embodiment of the conceptionthat I yet have contrived, and afterward I shall clearlypoint out and distinctly define the essential characteristics of the invention in the claims at the close of this specification. L p

In the drawings, Figure 1 is a side elevation of a jack constructed in accordance with my invention. Fig. 2 isa front elevation of I The main frame of the machine consists of two parallel vertical webs 1 1, provided with suitable strengthening-flanges and united by the braces 2. Between the said webs are located most of the working parts of the jack. There is also an offset standard 3, united to one of the webs 1 by the braces 4. A shelf 5 for the reception of the stock is shown in Fig. 1 as affixed to the front of the machine, but

'is omitted from Fig. 2 for the sake of clearness.

6 7 are fast and loose pulleys on a shaft 8,

, which latter is journaled in the frame and carries a fiy-wheel 9.

lOis a pitman whose rear end is pivoted to the fly-wheel 9 and whose forward end bears a head 11, the latter being shown as provided with a pebbling-roll 12, although in practice any other suitable tool or device may be applied to the said head, according to the 1 character of the work for which the jack is to be employed. 7

To the headll is pivoted the lower end of a beam 13, whose middle portion is connected to the frame by links 1414 and whose upper end alsoisconnected to the frame at the top thereof by the linksld 15.

16 is the bed, having, preferably, a surface of wood, on which the leather is laid to be op- Serlal No. 653.729. (No model.)

erated upon, and 17 is the metal bed-frame upon which the said wooden surface is affixed. The machine as thus far described is old and operates in the well known manner. When the fiy-wheel 9 is rotated, the pebblingroll or other tool or device carried by the head 11 traverses the table from front to rear in contact with the stock thereon, then lifts, then returns clear of the stock, and then descends and repeats its rearward traverse.

My invention relates particularly to the suspension and adjustment of the bed 16; and it consists in the mechanism designed to effect such suspension and adjustment with few and strong parts, having simplicity and compactness of construction, together with certainty and smoothness of operation. To this end I mount the bed, through the medium of connecting and supporting members, upon the free extremities of two levers that have their inner or contiguous ends formed as toothed sectors, and thereby adapted to mesh' or engage with each other. Thus in the drawings, 18 19 are two such contiguous levers, pivoted to the frame 1 at the points 20 21 and having their contiguous ends adapted to en gage with each other, preferably by being formed into sectors 22 23,that intermesh. The free ends 24: 25 of the levers are connected by rods 26 27 to the table, thereby supporting the latter. The rear rod 26 is non-adjustable, but is pivoted at each end, as shown. The two forward rods 27 27 are tapped through blocks 28 28, which latter are pivoted to the extremity 25 of the lever 19, (the said extremity being suitably formed with a lateral enlargement to support the said block,) and the rods are provided with hand-wheels 29 29 for turning them up and down in the blocks 28 28 and for thereby adjusting the inclination of the table for the purposes well known.

It will be apparent that in connection with the elements of my invention as thus far described I might employ a spring of any form and with any mode of connection and operation in order to sustain the table against the downward pressure of the pebbling-roll or other tool or device; Inasmuch as the simultaneous and equal elevation or depression of the engaging ends of the levers 18 19 is insured by the action of the intermeshing sectors the free ends of the said levers must 'rise and fall together, and thereby must cause the elevation or depression of the table to occur in constant parallelism to itself. Consequently a spring applied to any portion of the system will effect the proper suspension or support of the bed. I further have contrived, however, a mechanism by which such a spring may be conveniently placed and readily and securely adjusted. For this purpose I provide a third arm affixed to or integral with one of the said levers and projecting downward from the pivot thereof, and I pivot to the free extremity of the said arm one end of a rod,whose other end passes through a stationary collar and has confined upon it a spring provided with adjusting members. Thus in the drawings, 30 is the third arm of the lever 18 and projects downward and has pivoted to its extremity at 31 a rod 32. The said rod projects forward and is screwthreaded at its forward end and has mounted thereon the nut 33 and check-nut 3%, respectively, provided with the hand-wheels 35 36. The rod 32 passes through and plays in the sleeve 37, which latter is externally screwthreaded and is provided with a hand-wheel 38. The said sleeve in turn passes through the collar 39, but does not play freely in the same, the collar being internally screwthreaded to engage with the external threading of the sleeve. The said collar is held stationary with respect to the frame of the machine by being pivoted at 10. Such pivoting is required to accommodate the collar to the varying angle assumed by the rod with the swing of the arm 30 as the table yields to the pressure which is applied thereto.

42 is a spiral spring encircling the rod 32 and confined between an abutment 43 thereon and an abutment it on the rear end of the sleeve 37.

The adjustment of the foregoing mechanism is accomplished as follows: IVhen it is desired to lower the table without disturbing the tension of the spring 42, the hand-wheel 38 will be so turned as to move the sleeve 37 forward in the collar 39. Such movement does not disturb the relative position of the rod 32 and sleeve 37. IVhen, on the other hand, it is desired to adjust the tension of the spring 42, the check-nut 3% will be loosened and nut 33 will be turned forward to slacken the spring or rearward to compress it, the effect of such forward motion being to allow more space between the abutments 43 and 44 and the effect of such rearward motion being to allow less space between said abutments. As will be clear, when the abutments 43 and 471: are brought closer together the bed 16 will be lowered, and when the distance between them is increased the bed will be raised. The bed is therefore susceptible of very accurate and fine adjustment by means of the handwheel 35, while the resistance offered by the bed to the pressure or thrust of the pebblingroll may likewise be very accurately and finely adjusted by means of the hand-wheel 35.

I have shown my invention in the accompanying drawings as embodied in a pebblingjack and have described it as therein shown. I do not, however, desire to limit myself to the application of the invention to a pebblingjack, as a number of machines which operate in a manner similar to a pebbling-jack and which are employed in the finishing of leather-as, for example, jacks for glassing, rolling, stoning, &c.-are equally adapted to the employment of my invention.

I claim as my invention- 1. In aleather-finishing machine, the combination with a finishing-tool which travels over the surface of the bed, of a bed for supporting the stock While it is being operated upon, levers adjacent the bed and having their contiguous ends adapted to engage with each other, with their remote ends serving to support the bed, and means for yieldingly sustaining the bed under the pressure of the finishing-tool while its parallelism is maintained, substantially as described.

2. In a leather-finishing machine, the combination with a finishing-tool which travels over the surface of the bed, of a bed for supporting the stock while it is being operated upon, levers adjacent the bed and having their contiguous ends adapted to engage with each other, with their remote ends serving to support the bed, and a yielding memberconnected with the levers to sustain them against the pressure of the finishing-tool upon the bed, substantially as described.

3. In a leather-finishing machine, the combination of a bed for supporting the stock while it is being operated upon, connected sector-levers supporting the bed, a rod engaging one of the said levers, means for adjusting said rod to vary the position of the levers and thereby effect an adj ustment of the bed, and a spring on said rod which tends to hold the said bed in its normal position against the pressure of the finishing-tool, and means for adjusting the tension of the said spring, substantially as described.

4. In a leather-finishing machine, the eombination with a bed for supporting the stock while it is being operated upon, connected sector-levers for supporting the bed, a rod engaging one of the said levers, a sleeve on said rod, a collar threaded upon the sleeve and pivotally mounted 011 the frame, means for turning the sleeve within the collar to effect an adjustment of the rod, a spring on the said rod adjacent the said sleeve and an adjustingnnt on the said rod for adjusting the tension of the spring, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

EDIVARD l3. PARKHURST.

lVitnesses:

ALICE II. MORRISON, WILLIAM A. COPELAND. 

